xhci: Fix NULL pointer dereference when cleaning up streams for removed host

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commit 4b895868bb upstream.

This off by one in stream_id indexing caused NULL pointer dereference and
soft lockup on machines with USB attached SCSI devices connected to a
hotpluggable xhci controller.

The code that cleans up pending URBs for dead hosts tried to dereference
a stream ring at the invalid stream_id 0.
ep->stream_info->stream_rings[0] doesn't point to a ring.

Start looping stream_id from 1 like in all the other places in the driver,
and check that the ring exists before trying to kill URBs on it.

Reported-by: rocko r <rockorequin@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Mathias Nyman 2017-07-20 14:48:26 +03:00 • committed by Ben Hutchings

parent 4053c6292e

commit 96bfb7d084

1 changed files with 7 additions and 4 deletions

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11

drivers/usb/host/xhci-ring.c

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